watermark everything. I have learned that I have to watermark everything. But I have had people straight up steal my finished product pictures and pass them off as their own, so I trust no one. In the end, I would hope the other shop would see that it is your design and you watermarked it, but just like in any form of business, there are shady people out there that will just recreate it or something. If it is original, you do own it or so that's what I believe to be true...I am far from a lawyer so don't take my word to court with you. I hate people to waste my time, but also sometimes you have to do that in order to get their business. At least that's what I have experienced.